Handle and optionally optimize webp images

[cyrilwanner]

No description provided.

[codecov]

Codecov Report

Merging #8 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master     #8   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           1      1           
  Lines          30     42   +12     
  Branches       10     13    +3     
=====================================
+ Hits           30     42   +12

Impacted Files	Coverage Δ
index.js	100% <100%> (ø)	⬆️

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